you're all wrong guys, error 6 means "idiotic user" ps. Sorry radek, nie mogłem się powstrzymać, nie bierz tego do siebie.
I have this problem too... Every time I click on "Practice Offline" or when "Go Online" then click to enter on the arena this message appears... I don't know what to do, but when I reclick I can enter and play w/o preblems...